I tried x-men, but it doesn't work with eclipse 3.0 because of other required plugins (org.eclipse.xsd and org.apache.xerces)I tried to install them but:- org.eclipse.xsd writes some stuff to the error-log, It seems to depend on a plugin that is no longer valid with version 3.0- org.apache.xerces is removed from the apache-xml project.

so x-men seems to need some adaptation work for version 3.0 that is beyond my skill.